Estimation of the variation of 78 years’ mean annual temperature in the Ecohydrology Research Institute of The University of Tokyo Forests and its relation to the temperature increase in Nagoya caused by urbanization with correction for instrument error

Temperature observations in the Shirasaka meteorological observation field (Shirasaka) of the Akazu Research Forest, Ecohydrology Research Institute, the University of Tokyo Forests have been performed using various methods and observation equipment since 1930. The primary objective of this research is to create a time series of the 78 years’ annual mean air temperature data with a correction for the instrument error arising from the changes of observation equipment. A secondary objective is to investigate the relationship between the temperature increase due to urbanization seen in Nagoya and the 78 years’ annual temperature data observed at Shirasaka, Nagoya and Iida. The annual mean air temperature, after correction for instrument error, increased by 0.3 or 0.4 degrees compared with the figures before correction. The difference of mean annual temperature between Nagoya and Shirasaka starts increasing from the 1940s. The range of temperature increase caused by urbanization estimated by the JMA through urban climate model simulation was almost the same value as the estimated temperature increase through the observed mean annual temperature at Nagoya and Shirasaka, suggesting that the temperature difference between Nagoya and Shirasaka can be explained mostly by the urbanization of the Nagoya area, at least since the 1940s.

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論文
英文キーワード: annual mean air temperature, seventy eight years variation, Ecohydrology Research Institute of the University of Tokyo Forests|correction of instrument error, temperature increase by urbanization